Presentation Transcript

Sanitary Sewage Systems:

Objectives:

Important definitions:

Important definitions Aerobic – treatment of sewage with the use of oxygen
Anaerobic – treatment of sewage when no oxygen present
Building sewer – piping from house to sewer system.
Common collector – piping system that transports manure from 3 or fewer properties.

Important definitions:

Important definitions Liquid capacity – the volume of a tank below the outlet pipe
Subsurface seepage system – subsurface seepage field, seepage bed and system that treated sewage is released

How is the Code made?:

How is the Code made? Federal regulations
EPA
State regulations
EPA
Department of Public Health
ASTM – American Society for Testing and Materials
NSF – National Sanitary Foundation

General Requirements:

General Requirements Appendix A
Used to determine sewage flows

General Requirements:

General Requirements Designed to accept domestic sewage NOT
Discharge from roof or footing tile lines
Backwash water from water softener
Go thru seepage field but not septic tank
Hot tub wastewater
Motorized vehicle grease, oil & chemicals

Separation distances:

Separation distances horizontal sewer lines need to be 10 ft away from water lines
If sewer line is within 10ft of water line, the water line needs to be at least 18” above sewer line

Sanitary Sewer:

Sanitary Sewer Hook up to sanitary sewer when it is w/in 200ft of residential property w/ flow <1500gpm
>1500gpm hook up to sanitary system w/in 1000 ft

Pipe Size, Materials & Slope:

Sewer System Development:

Sewer System Development Do not design in area where surface water accumulates
Proper distances away from critical areas
No swimming pools, sprinkling systems, underground utilities in area
No limestone or bedrock w/in 4’ from bottom of system

Variance/Experimental Design:

Variance/Experimental Design Variance – an extension for a proposed installation that cannot be compliant with regulations
Experimental design – an unapproved sewage system that is being tested for approval by Dept of Health

Distribution Boxes:

Soil Tests:

Seepage Fields:

Seepage Fields Gravel
With gravel around piping
Gravelless
No gravel around piping
Chamber
Similar to gravelless

Seepage Fields:

Seepage Fields Size based on soil type
Between 6-24” of backfill over bed
5’ of undisturbed earth between septic tank & field
Top of seepage field at least 1” lower than distribution box or septic tank outlet

Seepage Fields:

Seepage Fields Bottom of field >3’ from bedrock w/ original soil
Max 2’ of fill soil can be used
Do not compact
Percolation test required

Gravel Seepage Field:

Gravel Seepage Field Bedding material
Clean gravel
¾”<diameter<4”
Full width of trench
6” below bottom of line
2” above top of line

Aerobic Treatment Plants:

Effluent Discharges:

Effluent Discharges Class I effluent can be discharged within 10’ of any surface water w/ 5:1 dilution
Discharges to water not flowing limited to 2:1 ratio
Common collector can discharge as long as not within 1 mi of public place and not >1500 GPD
Ground surface as long as 1discharge/ac